Savings include using fitter crews over the cost of welders, plus overhead savings such as safety, consumables, inspections and reworks.

Pressure and Temperature Ratings

Carbon Steel Pipe Fittings: CS Series

Lokring Carbon Steel Pipe Fittings

Lokring Size

Pipe NPS

Pressure Rating in PSI (Bar)

ASME B31.1

Pipe Schedules

ASME B31.3

Pipe Schedules

40

80

160

40

80

160

CS Pipe Product

P04

1/4”

4890
(337)

6610
(456)

*

6250
(431)

8810
(607)

*

P06

3/8”

4040
(279)

5600
(386)

*

5390
(372)

7470
(515)

*

P08

1/2”

3890
(268)

5250
(362)

4810
(332)

5190
(358)

7000
(483)

6410
(442)

P12

3/4”

3230
(223)

4400
(303)

4240
(292)

4300
(296)

5870
(405)

5650
(390)

P16

1″

3030
(209)

3975
(274)

3650
(252)

4050
(279)

5300
(365)

4870
(336)

P20

1-1/4″

2480
(171)

3350
(231)

*

3310
(228)

4460
(308)

*

P24

1-1/2″

2200
(152)

2930
(202)

*

2930
(202)

3900
(269)

*

P32

2″

1790
(123)

2420
(167)

*

2390
(165)

3230
(223)

*

P40

2-1/2″

2300

(159)

2550

(176)

*

2670

(184)

2970

(205)

*

P48

3″

1700
(117)

2260
(156)

*

2270
(157)

2470
(170)

*

P64

4″

1980

(137)

2640

(182)

*

2310

(159)

3070

(212)

*

* not tested

TEMPERATURE RATING:

Piping systems containing the piping assemblies listed may establish design pressures up to and including the ambient maximum design pressure given for temperature from -20° to 400°F (-28°C to 204°C) for ASME B31.1 and B31.3. For temperatures above 400°F the maximum design pressure given shall be multiplied by the temperature de-rating factor listed below.

Temperature De-rating Table for Carbon Steel (CS) Fittings

Temperature
°F (°C)

De-rating Factor B31.1

Temperature

De-rating Factor B31.3

400°

(204°)

1.00

1.00

500°

(260°)

0.95

0.95

600°

(316°)

0.87

0.87

650°

(343°)

0.75

0.75

LOKRING offers Carbon Steel Repair Couplings which are of a ‘slip-over’ design in order to facilitate repair work. They consist of a stainless steel body with carbon steel drive rings. Their pressure ratings are the same as those of LOKRING’s Stainless Steel Pipe Fittings and have a temperature rating of the Carbon Steel Pipe Fittings